Device for the relief of wagon-springs.



PATENATEDI MAR. 10, 1908.

R U A B Y A M W APPLICATION FILED MAB..15.1907.

3 SHEETS-SHEET 1.

weaves- No. 881,252. PATENTED MAR. 10, 1908.

' W. MAYBAGH.

DEVICE FOR THE RELIEF OF WAGON SPRINGS.

APPLIOATION FILED MAR.15,1907.

- s sgBETs-sHnnT 2.

No. 881,252. PATENTED MAR. 10, 1908. w. MA'YBAGH. I I DEVICE FOR THE'RELIEF OF WAGON SPRINGS.

APPLICATION FILED MAR IQ. 1907.

3 SHEETS-SHEET 3.

was I A 1 W834 zwwwus'r 2????72591? I UNITED STATES PATENT OFFICE.

WILHELM MAYBACH, OF QANNSTATT, GERMANY, ASSIGNOR TO DAIMLER MOTORENGESEIIL SCEIAFT, OF UNTERTURKHEIM-STUTTGART, GERMANY:

DEVICE FOR THE RELIEF OF WAGON-SPRINGS.

Specification of Letters Patent.

Patented. March 10, 1908.

Application flled. March 15,1907. Serial No. 869,481. 1

To all whom it may concern:

Be it known that I, WILHELM MAYBAon,

a subject of the King of Wiirtemberg, and) resident of 9Freiligrathstrasse, Cannstatt, in the Kingdom of Wiirtemberg, GermanEmpire, engineer, have invented-certain new and useful Improvements inDevices for the Relief of 'Wagon-Springs, of which the following is anexact specification. 4 j

- Many devices have been employed for the purpose of taking u shocks orjolts causedby uneven and roug roads, relieving thereby the wagonsprings and preventing atransmittingof such shocks upon the wagon box.

But most of these devices showed a certain defect in .as much as wagonsprings with attached devices were subjected to "higher Q during fastdriving over rough roads.

stresses than those springs without them. In other cases these deviceswere so constructed as to give way even to the smallest jolts, whichfaulty constructions take the spring cushioning out of the wagon box toa take up all jolts and shocks so that the impacts areequally dividedbetween the wagon-spri'ings and the device attached to them. agonsprings with such an attaohed device need not be so strong and mayreceive twice the amount of resiliency than springs without such anattachment. These 'disks'partiallyprovided with even and partially withuneven friction surfaces, are placed side by side and pressed againsteach other by means of a strong spring coil. As soon as a jolt or shockoccurs, this impact is transmitted to those disks and their relation toeach other in regard to their first position is changed in as much asthey are more or less turned around their axis, but the pressure enactedby one of the shifted disks upon the surface of the other one next to itdoes not increase in proprtion with the strength of the single blowsupon the wagon-springs, as

was the case in all former devices, but this pressure .is a rather smallone at the beginning of the blow and increases quite eonsiderabletowards the end of same. A good constructional form of such a deviceconsists of two disks provided with surfaces rising and fallingllkewaves, which disks are pressed against each other'by means of astrong spring coil and which are connected to insuch a way thatavibration of the wagon a 'isks, by means of which turns the relativepositions of those disks to one another are changed and a compression ofthe spring coil is achieved, in as much as the distance .or

e to the shifting 0 these uneven surfaces thereon, whereby the elevatedparts of one surfac'e-normally o posite the dented parts of the adjacentsu acecome opposite the elevated parts of the latter surface. Duringthis manipulation more or less friction, has to the disks absorbs theforces enacted by those shocks and jolts and prevents their transmittingthemselves to the wagon box. In order to'take up these more or lessheavy shocks by the disks in the lproper proportions, the surface of onedis wavelike form, whereas the'surface of the other disk facing this onemust be even, but providedwith some elevations, whichelevated partsshould be situated opposite the In order to make the invention betterunderstood, same is accompanied by drawings which show a constructionalform'of the device by way of example.

vice. Fig. 2 is a section out throughlines Y-Y. Figs. 4 and5 representface views of the friction disk surfaces. Figs. 6, 7 and 8 are sectionalside views of those disks. Fig. 9 represents the curved surfaces of thetwo friction disks sides if rolled off in a plane. Fig. 10 illustratesin form of a diagram the forces acting upon the device while inoperation.

'' vThe two friction disks a and b are each provided with a side arm aand b, which arms are fpivotally connected with projectfsns e 'o thewagojn-,.-;spring holder e by means of two connecting rods 0 and d. The,main shaft h on which those two disks turn is firmly attached to theupper or carriage frame w, whereas the spring holder e is will .ca'use aconcentric turn of these.

sipa'ce between two adj acerit disks is increased be overcome and thiswork accomplished by the wagon springs by suitable rods and plates musthave a deeper or' dented portions of the other disk.

Figure l'represents a front view of the de- X-X. Fig. 3 is a sectionthrough lines parts of this curved surface I) afiixed to the lower partor axle frame w. Two other disks f and g are placed one on each side ofthe friction disks a and l), which end plates are concentrically turnedto a certain degree by the friction disks. All four disks are held toether bythe bolt h, the head i of which is s aped like a saucer in orderto serve as a receptacle for the one end of the spring coil 7c. Theother end of this coil rests against disk 9 and by means of the springforce of this coil the four disks a and '12, f and g' are pressedclosely together. The friction between these disks can be regulated bytightening or loosening the nut Z at the other end of bolt h. The nut Zis provided with a suitable interlocking device Z.

The surfaces of the disks f a and b g are smooth and even but the innersurfaces a 2 of thedisks a b facing each other are formed in a wavelikemanner. N 0w if those two disks (1 and b are turned, the elevated partsof the surfaces being shifted and coming opposite one another will causea separating of the disks a and b, whereby the space between the Wavesurfaces (L2 b is increased and the. spring coil 7c will be compressedto a certain extent. Such a turning or shifting of the two disks aand 1) takes place every time the wagon s ring 1) receives a blow causedby a jolt on t e driving wheels, in'as much as the vibration of thespring 0 is transmitted to those friction disks a b by means of the twoconnection rods 0 (1 attached to projections e of spring holder 6 andside arms a b of the disks. The turning or displacement of the two disks(1 b becomes the larger, the greater the shock or jolt u on the drivingwheel, and the compression 0 the spring coil is by means of those twodisks a b will increase accordingly.

n order to avoid too great a spring compression by every small jolt thesurface 6 of the disk I) is evenly curved or waved whereas the surface aof the other disk at facing this waved surface I) is made even andprovided with certain elevations (1 In their normal positions theseelevations of are placed opposite the deep or dented portions of theother disk surface 6 whereas the highest are opposite the even andlowest parts of the surface a? of the other disk as is shown in Fig. 9.Thus a small shock will cause a little turn of the disks, the spacebetween them will increase very little and accordingly the spring coilcompression will be likewise a small one, but as soon as those disks areturned to a larger degree by stronger shocks, the space between .thedisks will be increased to a greater extent flay those uneven surfacesof the disks and consequently the springeoil it will be compressed to aconsiderably higher degree.

The increase and theilecreasc of the working forces acting on thisdevice are. illustrated by a diagram in Fig. 10. Here the straight linem n represents the action of the spring coil from 0 up to normal, and a0 is the one fron'rnormal up to maximum whereas a 1) represents thenormal and 0 q the maximum spring load. Thus the triangle 7) '21 1'represents the work to be accomplished by the wagon spring if subjectedto the strongest jolt while in its normal )osition and under nor :alload. Now the object of the present device is to prevent too great anenlargement of this work. The work represented by triangle 11 has to betaken up by the device but the actual work taken up by this device isrepresented in the diagram by a 0 s. The contents ofthis planerepresents almost the same as that of triangle 7? g r. The curved side as of the plane 11 0 8 corresponds with the conditions under which thestress is delivered, beginning with a small force which increases lateron to a much higher degree at about half way between the point a and sand remains constant towards the end 8, in fact it maydecreasc somewhattowards that end, which is done for the purpose of providing for asmooth driving on good roads and preventing too strong an end stress 01, the latter also represei'iting the maximum stress on thepneumaticltircs. In as much as the plane a o a represents friction workwhich is not repeated on the return path of the disks, the spring coilforce, as represented by triangle 7) q 1' comes in action as aretroactive force, but this force is counteractml by the friction workof the disks which in their return path are pressed against each otherby this coil and thus the two forces absorb themselves and are annulledthereby. l f suddenly a-n unloading of the wagon springs should takeplace the work of same represented by m n p iseountermated by a frictionwork m a t and absorbed. As will be observed by the above, the presentarrangement of such a device will prevent a repeated swinging andvibrating of the wagon springs in an up and down direction and insteadof having the impacts received absorbed by these repeated swingings orvibrations of the springs and wagon box, these forces are annulled attheir very beginning by the friction of the disks )rovidcd for. If thisdevice was left oil the wagon spring would have to take up the workrepresented by no s in the diagram besides, thus to tri angle p q 7'another triangle 7) '11 would have to be added, the contents of the lattcr representing those of the plane 11. 0 sf In other words the wagonspring would have to be made twice as strong in order i work added tothe same. Having thus fully described the nature of my invention, what Idesire to secure by Letters Patent of the United States isz-- 1. in adevice for the relief of wagonsprings the combination of scvcral disks Iplaced side by side and revolving around a to take up the axis firmlyattached to the carriage frame, the friction surfaces of which diskshave a wave-like form and are pressed against one enlarged frictionaresistance of thefriction surface at a ratio of but aslight increase atthe start and during the first part ofthe disks movements, but with aconsiderable increase towards the end position of the wholeg disktravel. r

2. A device for the relief of wagon springs consisting of two disks aand b, arranged side by side and pressedagainst each other by means of aspring coil k, said disks revolving concentrically around one shaft oraxis h, firmly attached to the carriage frame w, said disks beingprovided with friction surfaces bearing .upon one another in a wave-likeform, the auxiliary washers f and 3 g placed on each side of disks a andI), each 1 disk (1 and b being attached to the spring increase towardsthe end-position of the whole disk travel. I

3. A device for the relief of wagon-springs consisting of two disks aand I) placed side by side and pressed against each other by means of aspring coil it, said disks revolving concentrically around one shaft oraxis h; firmly attached to the carriage frame to, said disks beingprovided with peculiar shaped friction surfaces, of which the surface 6of the disk bis curved in form of waves, whereas the surface of disk anext to the one of disk I) iseven but provided with elevated portionsa", said elevations being rinder normal conditions situated opposite thedeep or dented parts of the surface I)" of disk I), each disk (L and I)being attached to the spring holder 1: of the main wagon spring 1) onthe axle frame w by means of side arms a b and connection rods 0, d andprojecting holder arms 6", so that each friction disk is shifted underincreased spring pressure and thereby enlarged frictionalresistance ofthe friction surfaces at a ratio of but a slight in crease at the startand during the first part of the disks movement-s, but with a conholder6 .of the main wagon spring '0 on the 1 siderablc increase towards theend-position axle frame w by means'of side arms a b of the whole disktravel. I

In witness whereof] have hereunto set my and connection rods 0, (Z andprojecting;

holder arms 6, so that each friction disk is shifted under increasedspring pressure and thereby enlarged frictional resistance of thefriction surfaces at a ratio of but a slight increase at the start andduring the first part of the disks movements but with a considerablehand in the presence of'two witnesses.

W] lil IELM MAY BACII'.

W'itnesses p Rosana UnLANo,

.KARL Karena.

